Multistage pressure automatic switch -over detects structure

The utility model provides a multistage pressure automatic switch -over detects structure, includes parallelly connected low pressure pilot operated directional control valve and middling pressure pilot operated directional control valve, and the oil -out and the low -pressure pressure sensor of low pressure pilot operated directional control valve are connected, and the oil inlet and the pressure hydraulic fluid port of low pressure pilot operated directional control valve are connected, and the oil return opening and the drain tap of low pressure pilot operated directional control valve are connected, the oil -out and the middling pressure pressure sensor of middling pressure pilot operated directional control valve are connected, and the oil inlet of middling pressure pilot operated directional control valve is connected with pressing the hydraulic fluid port, and the oil return opening and the drain tap of middling pressure pilot operated directional control valve are connected, the high pressure pressure sensor is connected with pressing the hydraulic fluid port, presses hydraulic fluid port and pressure -measuring opening tube coupling, drain tap and let out the oil pipe connection, the utility model discloses can switch automatically, fast to the range that corresponds, the ressure measurement scope is wide, measurement accuracy is high.